Port symbol-z-order symbol layout style-spec property to Native

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/Property.java

@@ -108,6 +108,27 @@ public final class Property {
   @Retention(RetentionPolicy.SOURCE)
   public @interface SYMBOL_PLACEMENT {}
 
+  // SYMBOL_Z_ORDER: Controls the order in which overlapping symbols in the same layer are rendered
+
+  /**
+   * Symbols will be sorted by their y-position relative to the viewport.
+   */
+  public static final String SYMBOL_Z_ORDER_VIEWPORT_Y = "viewport-y";
+  /**
+   * Symbols will be rendered in the same order as the source data with no sorting applied.
+   */
+  public static final String SYMBOL_Z_ORDER_SOURCE = "source";
+
+  /**
+   * Controls the order in which overlapping symbols in the same layer are rendered
+   */
+  @StringDef({
+      SYMBOL_Z_ORDER_VIEWPORT_Y,
+      SYMBOL_Z_ORDER_SOURCE,
+    })
+  @Retention(RetentionPolicy.SOURCE)
+  public @interface SYMBOL_Z_ORDER {}
+
   // ICON_ROTATION_ALIGNMENT: In combination with `symbol-placement`, determines the rotation behavior of icons.
 
   /**

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/PropertyFactory.java

@@ -1764,6 +1764,26 @@ public class PropertyFactory {
     return new LayoutPropertyValue<>("symbol-avoid-edges", value);
   }
 
+  /**
+   * Controls the order in which overlapping symbols in the same layer are rendered
+   *
+   * @param value a String value
+   * @return property wrapper around String
+   */
+  public static PropertyValue<String> symbolZOrder(@Property.SYMBOL_Z_ORDER String value) {
+    return new LayoutPropertyValue<>("symbol-z-order", value);
+  }
+
+  /**
+   * Controls the order in which overlapping symbols in the same layer are rendered
+   *
+   * @param value a String value
+   * @return property wrapper around String
+   */
+  public static PropertyValue<Expression> symbolZOrder(Expression value) {
+    return new LayoutPropertyValue<>("symbol-z-order", value);
+  }
+
   /**
    * If true, the icon will be visible even if it collides with other previously drawn symbols.
    *

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/SymbolLayer.java

@@ -170,6 +170,17 @@ public class SymbolLayer extends Layer {
     return (PropertyValue<Boolean>) new PropertyValue("symbol-avoid-edges", nativeGetSymbolAvoidEdges());
   }
 
+  /**
+   * Get the SymbolZOrder property
+   *
+   * @return property wrapper value around String
+   */
+  @SuppressWarnings("unchecked")
+  public PropertyValue<String> getSymbolZOrder() {
+    checkThread();
+    return (PropertyValue<String>) new PropertyValue("symbol-z-order", nativeGetSymbolZOrder());
+  }
+
   /**
    * Get the IconAllowOverlap property
    *
@@ -1004,6 +1015,9 @@ public class SymbolLayer extends Layer {
   @Keep
   private native Object nativeGetSymbolAvoidEdges();
 
+  @Keep
+  private native Object nativeGetSymbolZOrder();
+
   @Keep
   private native Object nativeGetIconAllowOverlap();